Resistance of roots pump exhaust duct

Исаев, А. А.; Raykov, A.; Бурмистров, А. В.; Salikeev, S.; Kapustin, E.

doi:10.1063/5.0075000

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Backward Flow In Molecular Flow Regime1

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2024

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“…We'll show the choice of the number of lobes on the basis of the maximal pumping speed of the Roots pump with the help of the CFD method. This method was used for the two-lobe Roots pump [16]. The pumping speed depending on the inlet pressure for the two-lobe, the three-lobe and the fourlobe profiles designed in the same case with R/A = 0.7067 is calculated.…”

Section: Backward Flow In Molecular Flow Regimementioning

confidence: 99%

Roots multi‐lobe vacuum pumps with external compression

Raykov,

Salikeev,

Burmistrov

et al. 2024

Vak Forsch Prax

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SummaryThe influence of the number of lobes on the working process of Roots vacuum pump is examined using the production vacuum pump NVD‐200 with a rotor profile based on an elliptical curve as a prototype. Design with two‐lobe, three‐lobe and four‐lobe rotor profiles was considered. Calculation of the main parameters characterizing profile quality (area‐utilizing ratio and conductance of rotor mechanism clearances) was carried out. The influence of rotor “plumpness” on pumping characteristics was studied. It is shown that the number of lobes providing the maximal pumping speed is different depending on the geometric parameters of the rotor.

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Section: Backward Flow In Molecular Flow Regimementioning

confidence: 99%